EP1693681B1 - Method and device for determining an initial position in a navigation system - Google Patents
Method and device for determining an initial position in a navigation system Download PDFInfo
- Publication number
- EP1693681B1 EP1693681B1 EP06002671A EP06002671A EP1693681B1 EP 1693681 B1 EP1693681 B1 EP 1693681B1 EP 06002671 A EP06002671 A EP 06002671A EP 06002671 A EP06002671 A EP 06002671A EP 1693681 B1 EP1693681 B1 EP 1693681B1
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- EP
- European Patent Office
- Prior art keywords
- gps
- road
- angle
- determining
- region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/26—Acquisition or tracking or demodulation of signals transmitted by the system involving a sensor measurement for aiding acquisition or tracking
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/22—Multipath-related issues
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/28—Satellite selection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/50—Determining position whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks
Definitions
- the present invention generally relates to a method and a device for determining a position of a mobile communication terminal, and more particularly relates to a method and device for determining an initial position in a personal navigation system using global positioning system (GPS) satellites to reduce a radio positioning error and to improve positioning accuracy in radio positioning for determining a position of a mobile communication terminal.
- GPS global positioning system
- a navigation system is mounted in a vehicle to determine its position and provide an optimum route to a desired destination.
- This navigation system conventionally determines a position of a vehicle using a global positioning system (GPS).
- GPS global positioning system
- the GPS satellite navigational system includes 24 satellites orbiting the Earth at an altitude of about 20.183 Km.
- GPS satellite navigation systems determine a position of a GPS receiver at a desired position by computing a time taken to receive radio waves (hereinafter called a GPS signals) transmitted by the GPS which are received by a GPS receiver.
- a GPS signals radio waves
- conventional automotive GPS navigation systems include a GPS receiver and a GPS sensor mounted at a predetermined position on a vehicle equipped with the GPS navigation system. These navigation systems determine a vehicle's position by analyzing GPS signals received from four satellites. However, there are various positioning error factors to take into consideration when determining a vehicle's position. These error factors include an ionospheric delay error, a satellite clock error, multipath error, and so on. Specifically, GPS navigation systems compute an arrival time of a radio wave from a satellite to the receiver, and computes a position therefrom. When a GPS signal is interrupted or reflected by an object (e.g., tall building, a roadside tree, etc.) which is typical in a metropolitan area, the GPS signal usually cannot be accurately received, and GPS positioning errors increases.
- an object e.g., tall building, a roadside tree, etc.
- a positioning error included in the GPS signal is about 5 m.
- Position error estimation on a two-dimensional plane is performed through a multiplication operation on a GPS signal and a horizontal dilution of precision (HDOP) value computed using a satellite constellation.
- the HDOP value is 2 to 3 when a high accuracy feature is absent. In this case, a position error in the range of 10 to 15 m can be estimated.
- the HDOP value may increase to 4 or more when a GPS receiver cannot receive a direct GPS signal transmitted from a satellite (due to an object blocking the GPS signal, etc.) and instead receives GPS signals from other more distant satellites. In this case, the position error increases to a value in the range of 20 to 30 m.
- GPS vehicle navigation systems can match an initial position to a position on a given road by referring to a map database (DB) even though a position error is about 30 m. Because distances between roads can typically exceed 30 m, a GPS position error does not affect an initial position determination. However, in the case of a pedestrian walking on a sidewalk for example, two sidewalks which are adjacent to and located on both sides of a road a personal navigation system (PNS) therefore cannot accurately determine which sidewalk of two sidewalks the person is walking on if the distance between the road centerline and the sidewalk is about 20 m and if a position error is about 30 m.
- PPS personal navigation system
- FIG. 1 illustrates an example in which an error in the conventional initial position determination occurs due to a GPS positioning error.
- the pedestrian is present on the sidewalk 10.
- An example in which an object 20 (e.g., a tall building, a roadside tree, etc.) is located adjacent to the sidewalk 10 will be described.
- the distance between a road centerline 40 and a sidewalk 10 or a sidewalk 60 is conventionally about 20 m.
- a GPS signal from a satellite may be reflected or diffracted by the feature 20. Accordingly, because the signal is not a direct signal, a position error of a GPS receiver increases.
- the position error has a radius of about 30 m or more from the pedestrian, it can be determined that the pedestrian is located at a position as indicated by reference numeral 50. Because the position 50 is present between the road centerline 40 and the sidewalk 60, the position of the pedestrian is actually measured near the sidewalk 60 opposite to the sidewalk 10.
- the PNS determines that the pedestrian is located on the opposite sidewalk 60, and determines an initial position based on the sidewalks 60 location.
- a position error may occur due to object interference, and a PNS the may erroneously determine that the pedestrian is located on an opposite sidewalk rather than on a target sidewalk when an initial position is determined which can inconvenience the user.
- the initial position of the pedestrian is matched to the opposite sidewalk rather than the target sidewalk, a large error occurs in a route guidance function and the quality of route guidance service is degraded.
- US-A-5 589 836 relates to the selecting of signals from navigation satellites.
- a selection is performed on signals that are directly or indirectly received from navigation satellites.
- the selection is carried out for a satellite receiver, whose antenna is mounted for example in a vehicle in the vicinity of the rear window or the front windshield.
- the satellites situated within the receiving range are recognized on the basis of the satellite's orbits, which are stored for example in a storage device of the receiver.
- the vehicle device receives satellites 1 through 5 directly, since the satellites are situated in the receiving range for the antenna.
- the entire receiving range may be sub-divided into sub-ranges. If a satellite is expected in one segment in accordance with its current position and the current direction of travel, but cannot be received, then a corresponding count cell is counted down.
- the count cell is counted up. If a satellite is measured in one sub-range more frequently than for example 75%, then it is assumed that the signals were received directly. If however a satellite is measured in a sub-range less frequently than 75%, then its signals are probably only reflected signals.
- US 2002/183926 A1 relates to a method for acquiring azimuth information.
- First and second planner patch antennas are disposed so that their sky coverage antenna is partially overlapped to form a common area, thereby dividing the antenna sky coverage area into a first area, a third area, and a common second area.
- a data processing unit first excludes the data of any GPS satellite for which the channel states of both GPS receivers indicate that synchronization has not been established. Next, the data of satellites whose satellite angle of elevation is 85 degrees or less are extracted. Then, the data processing unit compares the remaining data of each GPS satellite and discriminates in which of the first area, the second area and third area it is present.
- the satellite is decided to be present in the first area.
- DE 100 28 900 A1 describes a navigation system for determining position and direction.
- the signal strength of a satellite is measured. Based on the known positions of the satellites and the known receiving characteristics of the antenna and local conditions, the angle of orientation can be determined.
- GPS global positioning system
- GPS global positioning system
- the above and other aspects of the present invention can be achieved by a method for determining an initial position in a navigation system, computing a total number of global positioning system (GPS) satellites using a GPS signal intensity greater than a threshold value, determining a number of GPS satellites of each region of a plurality of regions, from which signals are received, when an area is divided into two regions with respect to a road centerline; and determining an initial position according to a comparison result based on the number of GPS satellites in each region.
- GPS global positioning system
- the present invention implements a function for identifying a current position of a user and providing route information for a desired destination. Accordingly, a mobile communication terminal in which a navigation system is mounted in accordance with the present invention accurately determines an initial position using a global positioning system (GPS) satellite constellation and a GPS signal intensity. In accordance with the present invention, a personal navigation service with an improved accuracy can be provided.
- GPS global positioning system
- FIG 2 is a block diagram illustrating a system for providing the personal navigation service in accordance with an embodiment of the present invention.
- a navigation system for determining a position of a portable personal navigation system (PNS) 200 and providing an optimum route to a desired destination is mounted and used in the PNS 200 carried by user (e.g., a pedestrian).
- PNS 200 conventionally determines its position using GPS signals received from GPS satellites (e.g., 210, 220, 230 and 240).
- the portable PNS 200 can receive geographic information from a route guidance server 260 when the pedestrian carries the portable PNS 200, it can display a position of the pedestrian carrying the PNS 200 on a map.
- the PNS 200 can display a map of an area based on a current position of the PNS 200 and simultaneously providing information about the shortest distance to a desired destination.
- the PNS 200 includes map data stored therein (or downloaded from an extemal source) and a GPS receiver (not shown) for measuring a position of the PNS 200.
- the PNS 200 measures its position using GPS signals received from GPS satellites 210, 220, 230 and 240, and displays, to its user (e.g., the pedestrian), a map of a specific area based on a reference point corresponding to the measured position.
- Methods for providing a pedestrian route guidance function using the navigation system include storing map data in a memory within the PNS and outputting a map based on a walking route; and a receiving data stored in the route guidance server 260 from a base station 250 wirelessly and outputting the received data.
- the GPS method is widely used.
- a user may designate and/or determine an initial position on the map using a touch screen or direction key.
- the user may accurately determine an initial position by inputting information about a main point.
- a GPS used to receive GPS satellite information and to then compute an absolute position regardless of a region is essential to automatically determine the initial position.
- the GPS computes a position using an arrival time of a GPS signal from a GPS satellite to the user, the accuracy of the initial position determination is reduced when a signal is interrupted or reflected by an object (e.g. tall building, etc.). Accordingly, a need exists for an algorithm capable of accurately determining which side of the road or sidewalk the user is located on even though the user is located near a tall building or other blocking feature.
- FIG. 3 is a block diagram illustrating an example in which a user located on a sidewalk adjacent to a tall building receives a GPS signal in accordance with an embodiment of the present invention.
- GPS signals from GPS satellites 130, 131 and 132 can be directly transmitted to a GPS receiver of the portable PNS without being blocked by any objects.
- GPS signals from the GPS satellites 141, 142 and 143 are obstructed by the object 120 (i.e. tall building) and only some of the GPS signals are transmitted and the remainder are reflected or otherwise blocked and/or attenuated. Accordingly, all the GPS signals from all of the satellites shown (i.e., 130, 131, 132, 141, 142 and 143) are not received by the PNS.
- a GPS signal of the GPS satellite 141 is reflected by an opposite object 122 and may be transmitted to the portable PNS.
- the PNS can determine that the GPS signal of the GPS satellite 141 is an obstructed radio wave.
- the PNS refers to a map database storing information about the layout of a road to divide an area in which the PNS is located into two regions (i.e., region-1 160 and region-2 170) on the basis of the road's centerline 150.
- region-1 160 and region-2 170 regions on the basis of the road's centerline 150.
- other references can be substituted for the road's centerline.
- the PNS can divide GPS satellites into two groups according to the regions 160 and 170.
- the PNS can determine which sidewalk the pedestrian walks on, by comparing the number of GPS satellites of signals received from the region-1 160 with the number of GPS satellites of signals received from region-2 170.
- the number of GPS satellites is computed by selecting associated GPS satellites from which the PNS receives GPS signals of more than a predetermined intensity. Accordingly, the PNS sets a minimum value SNR_min of an intensity (or signal to noise ratio (SNR)) of a GPS satellite signal directly transmitted to the GPS receiver and then detects the GPS signal intensity received from each GPS satellite. The PNS then compares the received GPS signal intensity (or SNR) with the minimum GPS signal intensity SNR_min. The PNS first selects a satellite with the GPS signal intensity (or SNR) greater than the minimum GPS signal intensity SNR_min through a comparison process. Through this process, the PNS can compute the total number of GPS satellites with the signal intensity greater than the minimum GPS signal intensity SNR_min. The total number of GPS satellites from which the PNS receives signals with more than the predetermined intensity is set to N.
- SNR_min an intensity (or signal to noise ratio (SNR)) of a GPS satellite signal directly transmitted to the GPS receiver and then detects the GPS signal intensity received from each GPS satellite
- a GPS satellite constellation and the PNS's position can be represented on the two-dimensional plane as illustrated in FIG. 4 .
- a GPS satellites are arranged in each region 160 and 170 as shown.
- the present invention proposes a method for determining how many GPS satellites are arranged in region-1 160 and region-2 170 into which an area is divided with respect to the road's centerline 150.
- a clockwise angle to the road with respect to a predetermined position such as due North (N) on the two-dimensional plane is set to Road_angle 1
- a clockwise angle to an associated GPS satellite with respect to a predetermined position such as due North, i.e., an azimuth angle is set to Sat_angle such that the number of GPS satellites can be computed for region-1 160.
- the number of GPS satellites for region-1 160 and region-2 170 can be computed using Equation (1 below.
- N_region 1 denotes the number of satellites for region-1 160
- the number of GPS satellites for Region 1 can be computed as follows.
- the Road_angle1 is a first angle at the clockwise angle to the road on due north basis.
- the PNS determines if the azimuth angle Sat_angle 1 for the GPS satellite 132 is present between Road_angle 1 and Road_angle 2.
- the PNS determines that the GPS satellite 132 is located in Region-1 160. If the azimuth angle Sat_angle 2 for the GPS satellite132 is greater than Road_angle 1 and less than Road_angle 2, the PNS determines that the GPS satellite 132is located in Region-1 160. Likewise, if the azimuth angle Sat_angle 3 for GPS satellite 130 is greater than Road_angle 1 and less than Road_angle 2, the PNS determines that the GPS satellite 130 is located in region-1 160.
- the PNS determines that the GPS satellite 141 is not located in Region-1 160 and is therefore in another region i.e., region-2 170.
- the GPS satellites 130, 131 and 132 are located in region-1 160 through the above-described method.
- the number of GPS satellites in region-2 170 is equal to 1 and hence it is determined that region-1 170 has only one satellite (i.e., 141). Accordingly, because N_region 1 > N_region 2, it can be determined that a signal received from a satellite in one direction distinguished on the basis of the road is interrupted. A comparison result between the two regions must be used to determine which sidewalk the pedestrian is located on.
- the initial position is determined. Because N_region 1 and N_region 2 are equal to 3 and 1, respectively, N_region 1 > N_region 2.
- the minimum number of GPS satellites in region-1 is greater than or equal to 3.
- the initial position of the pedestrian is a sidewalk of region-2 170 with respect to the road.
- the PNS can provide the user (e.g., pedestrian) with a walking route guidance service.
- Another embodiment of the present invention can limit the above-described method to increase an initial position determination probability.
- an estimated position error value exceeds the distance between a road's centerline and an adjacent sidewalk after a position error of the user is estimated using the conventional horizontal dilution of precision (HDOP) method
- an initial position determination method can be applied using the GPS signal intensity and the GPS satellite constellation.
- the distance between the road's centerline and the, sidewalk can be computed on the basis of the number of lanes of the road.
- the number of lanes of the road is stored in the map database.
- FIG. 5 is a flow chart illustrating a process for determining an initial position of a pedestrian in accordance with an embodiment of the present invention.
- the PNS measures a GPS signal intensity in step 500. Then, the PNS proceeds to step 505 to determine if the measured GPS signal intensity is greater than a threshold value representing the minimum signal intensity. If the measured GPS signal intensity is greater than the threshold value, the PNS proceeds to step 510 in which an associated GPS satellite with a GPS signal intensity greater than the threshold value is selected and the total number of satellites from which the PNS receives signals is set to N. The PNS proceeds to step 515 to divide an area into region-1 and region-2 with respect to a road's centerline. In step 520, the PNS computes Road_angle representing an angle to the road with respect to due North (or another preselected position) on a two-dimensional plane.
- Road_angle representing an angle to the road with respect to due North (or another preselected position) on a two-dimensional plane.
- the PNS computes an azimuth angle Sat_angle for the selected GPS satellite.
- the PNS determines if an azimuth angle Sat_angle for each GPS satellite is in the range between Road_angle and Road_angle + 180 degrees such that the number of GPS satellites is computed for one of the two regions into which the area is divided with respect to the roads centerline. In this case, one region is determined using a road angle, and an angle for the one region is greater than the road angle and less than the (road angle + 180 degrees).
- the PNS determines the number of GPS satellites in Region 1 and sets the number of satellites in Region 1 to N_region 1 in step 535. Then, the PNS proceeds to step 540 to compute the number of GPS satellites in Region 2. Because the total number N of GPS satellites from which the PNS receives signals is already known, N_region 2 representing the number of GPS satellites in Region 2 is obtained by subtracting N_region 1 from the total number N of GPS satellites. When N_region 1 and N_region 2 are computed, the PNS proceeds to step 545 to compare N_region 1 with N_region 2.
- the PNS proceeds to step 550 to determine an initial position according to a comparison result.
- the number of GPS satellites in one region is greater than that in the other region in the comparison result, it is determined that the user (e.g., the pedestrian) is located on a sidewalk opposite to the region in which the number of GPS satellites is greater.
- the greater number of GPS satellites in the associated region must be at least 3.
- the present invention provides convenience for a pedestrian by accurately determining an initial position of the pedestrian and performing a route search and walking route guidance. Moreover, the present invention can determine which of the sidewalks adjacent to a given street a pedestrian is located on, using a GPS satellite constellation and a GPS signal intensity. Accordingly, a walking route service can be accurately provided to the pedestrian even when a pedestrian crossing or subway is present on a given route.
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Automation & Control Theory (AREA)
- Navigation (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Traffic Control Systems (AREA)
- Instructional Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020050012732A KR101154079B1 (ko) | 2005-02-16 | 2005-02-16 | 네비게이션 장치의 초기 위치 결정 방법 |
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EP1693681A1 EP1693681A1 (en) | 2006-08-23 |
EP1693681B1 true EP1693681B1 (en) | 2013-01-23 |
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EP06002671A Expired - Fee Related EP1693681B1 (en) | 2005-02-16 | 2006-02-09 | Method and device for determining an initial position in a navigation system |
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US (1) | US7577526B2 (ko) |
EP (1) | EP1693681B1 (ko) |
JP (1) | JP4209895B2 (ko) |
KR (1) | KR101154079B1 (ko) |
CN (1) | CN100578255C (ko) |
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-
2005
- 2005-02-16 KR KR1020050012732A patent/KR101154079B1/ko not_active IP Right Cessation
-
2006
- 2006-02-07 JP JP2006030295A patent/JP4209895B2/ja not_active Expired - Fee Related
- 2006-02-09 EP EP06002671A patent/EP1693681B1/en not_active Expired - Fee Related
- 2006-02-14 US US11/353,460 patent/US7577526B2/en not_active Expired - Fee Related
- 2006-02-16 CN CN200610008227A patent/CN100578255C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US7577526B2 (en) | 2009-08-18 |
CN1821806A (zh) | 2006-08-23 |
EP1693681A1 (en) | 2006-08-23 |
US20060184324A1 (en) | 2006-08-17 |
KR101154079B1 (ko) | 2012-06-11 |
JP4209895B2 (ja) | 2009-01-14 |
CN100578255C (zh) | 2010-01-06 |
KR20060091942A (ko) | 2006-08-22 |
JP2006227004A (ja) | 2006-08-31 |
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